<template>
  <div>
    <span>count：{{ count }}</span>
    <button @click="handleClick">count++</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      count: 0,
    };
  },
  methods: {
    handleClick() {
      this.count++;
      this.$emit("change", this.count);
    },
  },
};
</script>
